I believe a spotter that knows what they are doing and knows how to communicate with the driver is a good idea, but as stated, not fool proof.
I also often get out and look myself. I have sometimes gotten out 4 times while positioning my RV. I am not embarrassed. I will get out and look as many times as I need. (I also do set myself benchmarks, like I may notice a branch of a tree over the power outlet, so I know when I brush against the tree twigs, I am 1 foot from the outlet post, etc)
I have several cameras, and use them, but prefer not to position myself too tight with them. I find it hard to accurately judge the actual distance from that screen, relative to the value of getting out and looking.
I still like the idea of corner markers if you cannot see the front. I believe corner markers will be of little or no value for the rear corners as they are too far away.
Karl I. Sagal KarlSagal@Gmail.com
Well done is better than well said. (Ben Franklin)
1988 Fleetwood Southwind, 34'